@jtruestedt Has spotted the error. There is no such component as all in Ubuntu. You should leave this field blank in order to sync all available components. If you put all the plugin will try to synchronize a component called “all” which does not exist/is empty, resulting in zero packages.
If you don’t want to sync all components you can have some subset of main multiverse restricted universe.
Note that once a thread has been marked solved like this one, it is normally better to open a new one for new questions.
That being said, I am going to point you at a place in the orcharhino documentation. The procedure described here is largely the same for Katello. (To get started you only really need steps 1. to 6.) If you still have questions after reading the docs, I suggest opening a new thread in this forum. Try to explain exactly what you tried to do (and what did not work).
P.S.: When you say you are using Foreman, do you mean “Foreman with Katello” or “plain Foreman”? The features being described here are Katello features.
